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ascidian

[uh-sid-ee-uh n] /əˈsɪd i ən/
noun
1.
any solitary or colonial tunicate of the class Ascidiacea, exhibiting in the larval stage the vertebrate characteristics of a notocord and hollow nerve cord.
adjective
2.
belonging or pertaining to the class Ascidiacea.
Origin
1855-1860
1855-60; < New Latin Ascidi(um) a tunicate genus (see ascidium) + -an
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ascidian

ascidian

/əˈsɪdɪən/
noun
1.
any minute marine invertebrate animal of the class Ascidiacea, such as the sea squirt, the adults of which are degenerate and sedentary: subphylum Tunicata (tunicates)
2.
ascidian tadpole, the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord
adjective
3.
of, relating to, or belonging to the Ascidiacea
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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